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The world population counter does not actually tick up every time someone is born. By using past census data the rate of population increase can be determined rather accurately.
The counter then shows the predicted increase over the course of one year but instead of updating the number just once each year, it divides the estimated number of people who will be born in that year by the number of seconds in a year, giving the appearance of a counter that is ticking upwards continuously.
According to global statistics, the world population on earth increases by 2.5 people every second and so implies 150 people per minute.
However, this number is both commonly misunderstood and misinterpreted as it does not mean 2.5 new born people in every second. Rather, 4.3 people are born on average in every second while 1.8 people die in the same time.
In a whole, this implies an increase of 2.5 people per second (4.3 born people minus 1.8 dead people equals 2.5). Extrapolated, these figures imply a number of 137 million people born every year on a global level whilst 58 million people die in the same period of time.